5 little frogs at different layer heights. Top left to bottom is 0.34, 0.27, 0.1, 0.06 and 0.034. The last one came out a bit bad in places but the smoothness of the back is truly amazing.
Hmm need to take a better picture. That one sucks 
Nice., What’s your preferred layer height then. smoothness vs accuracy…
And what printer are you using?
Why those exact heights? You should make your heights multiples of a single step on the z axis to avoid odd effects.
This is made on an Ultimaker in PLA. The 0.34 was just an experiment and “beautiful” items I would go for 0.06 and for practical items 0.1.
I was just curious why you went for 0.034 as the minimum. Looking at the ultimaker wiki, your z steps per mm is 300*8/3. That means your minimum step is 0.001875mm. 0.06 is a multiple of this, so that shouldn’t be an issue. However, 0.034 is not a multiple, so you may be getting some rounding errors. Try 0.03 instead. That’s 16 steps on the z motor per layer height.
Thank Ketyl, didn’t think of that. The height came from another test with an Replicator2. Will give it a try in a moment!!!
It’ll be interesting to hear if that actually makes a visible difference if you print it. The rounding error is small, but at very small layer heights it might become significant. I figure it’s about 2-3% in your print. Depends if there are any other inaccuracies that are greater.
It worked much better. Printing nicely at 0.03 now.
@Ketil_Froyn , here is the frog at 0.03. Some artifacts but much better than at 0.034.
https://plus.google.com/u/0/104199731463622588564/posts/PgHQuENi2fh
Trying 0.015 now 
I believe you need to adjust your extrusion multiplyer a little. Those tiny bumps may dissapear when you extrude a little less plastic.
@Mano_Biletsky_Open_M , what is the best way to do that? Decrease filament width or just lower flow rate? Also I am printing quite warm, 220-225 degrees. Perhaps I should lower the temp?